EP2581727B1 - Dispositif et procédé destinés à déterminer des coefficients de frottement - Google Patents

Dispositif et procédé destinés à déterminer des coefficients de frottement Download PDF

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Publication number
EP2581727B1
EP2581727B1 EP12185197.6A EP12185197A EP2581727B1 EP 2581727 B1 EP2581727 B1 EP 2581727B1 EP 12185197 A EP12185197 A EP 12185197A EP 2581727 B1 EP2581727 B1 EP 2581727B1
Authority
EP
European Patent Office
Prior art keywords
containers
conveyor
friction
railing
rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12185197.6A
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German (de)
English (en)
Other versions
EP2581727A3 (fr
EP2581727A2 (fr
Inventor
Johann Hüttner
Martin Seger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Krones AG
Original Assignee
Krones AG
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Publication date
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Publication of EP2581727A2 publication Critical patent/EP2581727A2/fr
Publication of EP2581727A3 publication Critical patent/EP2581727A3/fr
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Publication of EP2581727B1 publication Critical patent/EP2581727B1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/10—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/20—Means incorporated in, or attached to, framework or housings for guiding load-carriers, traction elements or loads supported on moving surfaces
    • B65G21/2045—Mechanical means for guiding or retaining the load on the load-carrying surface
    • B65G21/2063—Mechanical means for guiding or retaining the load on the load-carrying surface comprising elements not movable in the direction of load-transport
    • B65G21/2072—Laterial guidance means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials

Definitions

  • the invention relates to a device and a corresponding method for determining coefficients of friction in the event of friction of containers that are transported on a conveyor, on railings of the conveyor, wherein the containers are guided between railings running on both sides, with a measuring table and a first sensor, which on is attached to the measuring table according to the preamble of claim 1.
  • the containers are often transported on single or multi-lane transport routes, so-called transporters.
  • a typical example is a filling system for filling beverages into PET containers / bottles.
  • handrails running on both sides that is, handrails running on the left and right, are typically used on the conveyors.
  • widening or narrowing occurs on the transport routes. There are therefore transitions from single-lane to multi-lane conveyors and vice versa from multi-lane conveyors to a smaller number of lanes, in particular to single-lane conveyors.
  • a dynamic pressure can also build up in a single or multi-lane feed in front of a treatment element of the system.
  • the dynamic pressure will always lead to the fact that there are force components in the movement of the containers that do not point in the direction of transport, but act perpendicular to it, i.e. act on the railing. This raises the question of how strong the friction of the containers on the railings of the conveyor will be, especially in such areas.
  • a boom provided above the conveying level should bring the vessel to be transported into contact with the conveyor belt and the deflection of the boom caused by this should provide a signal for influencing the conveyor.
  • the JP 55125429 A discusses the use of a test container prepared with measuring probes, which runs through a transport route to be examined, in order to record frictional forces, pressure values and impact forces that act on the test container during transport.
  • the EP 1 790 968 A1 and the EP 1 790 968 A1 disclose a measurement of the friction between the container bottom and the conveyor belt.
  • F R denotes the frictional force / frictional force
  • F N denotes the normal force
  • ⁇ denotes the coefficient of friction / coefficient of friction / coefficient of friction.
  • the frictional force F R always acts parallel to the contact surface of the body.
  • the normal force F N is the force with which one body acts on the other body, for example on a base.
  • ⁇ sliding ⁇ stick and ⁇ roll ⁇ ⁇ sliding generally applies.
  • the coefficient of friction ⁇ is a dimensionless number that results from normalizing the friction force F R with the normal force F N.
  • the object of the present invention is to quantitatively record the interaction between containers and railings and in particular the friction between containers and railings under production conditions.
  • the invention provides a device for determining coefficients of friction in the event of friction of containers which are transported on a conveyor, on railings of the conveyor, the containers being guided between railings running on both sides, comprising: a measuring table; a first sensor which is attached to the measuring table, wherein at least a section of the railing in the area of the measuring table is designed to be movable relative to the measuring table and the section executes at least one movement in one direction, called the x-direction can, which is substantially parallel to the transport direction of the conveyor, wherein the first sensor measures a force with which the movable section of the railing is moved or pushed during the transport of the container on the conveyor.
  • a guide preferably a linear guide and particularly preferably with rolling friction, can be seen under a measuring table, with which the movable section of the railing is guided along the transport direction.
  • measurements can therefore be made on site and inline directly on the conveyor and the friction under production conditions or even during production can be viewed quantitatively.
  • corresponding devices can be used at various points in a device for treating containers, for example a filling plant.
  • the railings of the conveyor can be separated at least at one point on one side.
  • the railing section under consideration can be integrated into the measuring device and at the same time serves as a guide for the containers to be transported.
  • the movable railing section is carried along somewhat in the transport direction due to the friction, whereby a deflection of the railing section can be determined.
  • this deflection in the transport direction can be displayed immediately as a force and passed on.
  • These forces in the x direction can also be referred to as longitudinal forces.
  • a plurality of sensors, for example two or three or even more sensors, can also be used for the measurement, the number of sensors being able to depend on the measuring ranges of the sensors.
  • the first sensor can be a strain gauge or a piezoelectric sensor that is attached to the outside of the railing section.
  • the strain gauge or piezoelectric sensor expands under the action of longitudinal forces on the railing, which act essentially parallel to the transport direction.
  • Strain gauges can be glued to the railing as wire, foils or semiconductor strips and allow a very compact arrangement to determine the longitudinal forces.
  • the first sensor can be attached to the measuring table, the movable section of the railing being able to execute a movement in a direction, called the x-direction, which is essentially parallel to the transport direction, wherein the first sensor can measure a force , with which the movable section of the railing is moved or pushed in the x-direction during the transport of the container.
  • the device can further comprise a control unit and a storage unit, wherein the control unit stores the measured values of the first sensor on the storage unit and is designed such that they are based on the measured values of the first sensor taking into account data relating to transverse forces that are substantially perpendicular to the
  • the transport direction of the conveyor can be exercised through the container on the railing, which can determine the coefficient of friction.
  • the control unit can be an internal control unit, for example a computer.
  • the control unit can also be wirelessly connected to a control computer, for example.
  • the data measured by the sensor can be stored on a storage unit and called up. This also offers possibilities to be able to compare the data at different time periods and thus also to be able to consider a time dependency of the development of the measured data.
  • the measurements can be carried out regularly at certain time intervals.
  • the storage unit can comprise a suitable storage unit, for example a hard disk or a flash memory.
  • the data relating to the transverse forces are used to standardize the measured frictional forces, i.e. to obtain dimensionless coefficients of friction.
  • relative frictional forces for example in relation to a mean frictional force, can also be viewed as a dimensionless variable and deviations from this can be viewed in percent.
  • the transverse forces can be specified, that is, predefined. Values for the transverse forces can be measured independently of the device by a separate measurement or can be specified on the basis of empirically determined data in order to obtain a suitable normalization variable.
  • control unit is designed, for example, in such a way that it compares the coefficients of friction and / or the measured values of the first sensor with a corresponding threshold value and initiates preventive and / or corrective measures if the corresponding threshold value is exceeded.
  • the coefficients of friction or frictional forces determined above can each be compared with a corresponding threshold. If the threshold is exceeded, preventive and / or corrective measures can be initiated. Depending on the size of the deviations or the exceeding of the corresponding thresholds, possible measures can initially aim not to stop production, but rather to reduce possible obstacles, see below.
  • the data relating to the transverse forces are predetermined data that are stored, for example, on the storage unit.
  • the data relating to the transverse forces can be determined independently and at a different point in time than the currently measured frictional forces, which can be measured with the aid of the first sensor. Therefore, stored data can be retrieved and used to normalize these frictional forces.
  • the data relating to the transverse forces can, however, also be determined within the measuring device.
  • the device can comprise a second sensor that measures a force that acts essentially perpendicular to the x-direction and essentially parallel to the plane of the conveyor (y-direction) and on the movable section of the railing during the transport of the container on the Carrier is exercised.
  • the second sensor can also be a strain gauge or a piezoelectric sensor, which is attached to the outside of the railing section and essentially parallel to the transport direction.
  • strain gauge or piezoelectric sensor is therefore typically attached to the outside of the railing and expands under the action of compressive or stretching forces on the railing, which act essentially perpendicular to the direction of transport.
  • Strain gauges can be glued to the railing as wire, foils or semiconductor strips and allow a very compact arrangement to determine the transverse forces.
  • the second sensor can be attached to the measuring table, wherein the movable section of the railing can also execute a movement in a direction, called the y-direction, which is essentially perpendicular to the x-direction and essentially parallel to the plane of the Is conveyor, wherein the second sensor can measure a force with which the movable section of the railing is moved in the y-direction during the transport of the container.
  • the second sensor By using the second sensor, the movement of the railing in the y-direction, that is to say essentially perpendicular to the x-direction and thus in the transport direction, can also be measured. It goes without saying that the force is considered in or parallel to the plane of the conveyor.
  • the function of the second sensor can be similar to the first sensor. Again, several sensors can also be used as a second sensor.
  • control unit can be designed such that it stores the measured values of the second sensor on the memory unit and based on the measured values of the first Sensor, taking into account the data relating to the transverse forces that are exerted essentially perpendicular to the transport direction of the conveyor through the container on the railing, determines the friction values, the data relating to the transverse forces being based on the measured values of the second sensor.
  • the measured values measured with the aid of the second sensor can be stored in the memory unit by means of the control unit, similar to the measured values measured with the first sensor.
  • the measurements take place essentially simultaneously, so that at the time of the measurement a pair of values is available for the frictional force in the x-direction and the transverse force, i.e. the normal force perpendicular thereto.
  • no predetermined values, as described above have to be used to normalize the force measured in the x direction, but rather the friction values can be determined from the value pair measured with the two sensors.
  • the development of the coefficients of friction over time can also be viewed and regular measurements and determinations of the coefficients of friction can be made.
  • control unit can be designed in such a way that it compares the coefficients of friction and / or the measured values of the second sensor with a corresponding threshold value and initiates preventive and / or corrective measures if the corresponding threshold value is exceeded.
  • the preventive measures can include maintenance of the conveyor, and the corrective measures can include at least one of the following measures to reduce friction: adding additives, for example lubricants, during the manufacturing process of the containers or preforms, applying lubricants or spraying on Water on the railings of the conveyor, spraying water on the containers, applying lubricant to the preforms or generally changing process parameters in the manufacture of preforms or containers.
  • additives for example lubricants
  • the preventive measures can include maintenance of the transporter or parts of the system.
  • the corrective actions can be aimed at the production operation to maintain and, for example, to reduce increased, undesired friction of containers on the railings.
  • the device can furthermore comprise a first rail which is fastened on the measuring table and which points essentially in the x-direction, wherein the movement of the section of the railing can take place in the x-direction by means of the first rail.
  • the railing section can thus be suitably mounted on a plate which typically slides or rolls with one or more guide carriages or guide wheels on the rail.
  • a plate which typically slides or rolls with one or more guide carriages or guide wheels on the rail.
  • the sliding or rolling friction on the rail is significantly smaller than the friction to be examined between the containers and the railing. It goes without saying that several parallel rails can also be used.
  • the device can furthermore comprise a second rail which is fastened to the measuring table and which points essentially in the y-direction, wherein the movement of the section of the railing can take place in the y-direction by means of the second rail.
  • the railing section can therefore also be mounted on a plate suitable for the y direction, which typically slides on the rail with one or more guide carriages or guide wheels.
  • the movement of the railing section is implemented in a specific direction in a simple and robust manner.
  • the sliding or rolling friction on the rail is in turn significantly smaller than the friction to be investigated between the containers and railings. It goes without saying that several rails can also be used for the considered y-direction, which run parallel.
  • the measuring table can comprise a base plate, the first rail being attached to the base plate, a further plate being able to move on the first rail, the movement of the further plate taking place in the direction corresponding to the direction of the first rail the second rail being fastened to the further plate, the movement of the section of the railing on the second rail being able to take place in the direction which corresponds to the second rail; or wherein the second rail is fastened to the base plate, wherein a further plate can move on the second rail, the movement of the further plate taking place in the direction corresponding to the direction of the second rail, the first rail on the further plate is attached, wherein on the first rail, the movement of the portion of the railing can take place in the direction that corresponds to the first rail.
  • the described arrangement allows the movements and thus the force measurement of the railing section to be decoupled in the x-direction and in the y-direction.
  • the measuring device remains compactly limited to the measuring table, which remains essentially statically fixed.
  • the order of the plates, which can move in the x-direction or in the y-direction, can be selected as desired.
  • the invention also provides a method for determining coefficients of friction in the event of friction of containers that are transported on a conveyor, on railings of the conveyor, the containers being guided between the right and left rails, with at least a portion of the railing being designed to be movable and the section can perform at least one movement in a direction, called the x-direction, which is essentially parallel to the transport direction of the conveyor, so that a force can be measured with which the movable section of the railing during the transport of the container on the Conveyor is moved.
  • the force in the x-direction can be measured by means of a strain gauge or a piezoelectric sensor that is attached to the outside of the railing section and is located on the railing under the influence of longitudinal forces.
  • the coefficients of friction can be determined from the measured values of the force on the movable section of the railing in the x direction, taking into account data relating to transverse forces that are exerted on the railing essentially perpendicular to the transport direction of the conveyor through the container.
  • the measured coefficients of friction and / or the measured values of the force in the x direction can be compared with a corresponding threshold value and preventive and / or corrective measures can be initiated if the corresponding threshold value is exceeded.
  • the data relating to the lateral forces can be predetermined data.
  • a force can also be measured which is exerted in a direction, called the y-direction, which is essentially perpendicular to the x-direction and essentially parallel to the plane of the conveyor, on the movable section of the railing during the transport of the container is exercised by the carrier.
  • the force in the y-direction can be measured by means of a strain gauge or a piezoelectric sensor that is attached to the outside of the railing section and is attached essentially parallel to the transport direction.
  • the movable section of the railing can additionally execute a movement in a direction, called the y-direction, which is essentially perpendicular to the x-direction and essentially parallel to the plane of the conveyor, wherein the force can be measured with which the movable section of the railing is moved in the y-direction, while the container is being transported on the conveyor.
  • the coefficients of friction can be determined from the measured values of the force in the x-direction, taking into account the data relating to the transverse forces that are exerted on the railings essentially perpendicular to the transport direction of the conveyor through the container, the data relating to the transverse forces being determined based on the measured values with regard to the force in the y-direction.
  • the measured values of the force in the y-direction can be compared with a corresponding threshold value and preventive and / or corrective measures can be initiated if the corresponding threshold value is exceeded.
  • the preventive measures can include maintenance of the transporter, and the corrective measures include at least one of the following measures to reduce friction: adding additives, for example lubricants, during the manufacturing process of the containers or preforms, applying lubricants or spraying on of water on the railing of the conveyor, spraying water on the containers, applying lubricant to the preforms or generally changing process parameters in the manufacture of preforms or containers.
  • additives for example lubricants
  • the measuring device with the measuring table can be mounted in the single-lane area on the conveyor directly in front of an infeed screw or in a single-lane feed. It is also possible to artificially create an inclined contact point on a widened conveyor or to use an overfeed, i.e. an area in which the number of lanes of the conveyor changes. The data obtained allow conclusions to be drawn about the condition of the railings and the containers.
  • Figure 1 shows the general conditions when a pressure force acts on a container on an inclined surface, for example a railing or a lateral guide rail.
  • a container 101 is shown, which is attached to an inclined surface 100 under the action of the force F. P is pressed.
  • the inclined surface 100 is inclined with respect to the flat surface 102 by the angle ⁇ .
  • the direction of transport for the container 101 is indicated by the arrow 105.
  • a coordinate system for defining the x-direction parallel to the transport direction and the y-direction perpendicular to the transport direction is shown.
  • the Figure 2 shows a conveyor 3 with a device 9 for determining coefficients of friction according to the present invention.
  • the conveyor 3 transports containers, for example bottles (not shown here) in a transport direction indicated by the arrow 3A. Segments or plates 3B of the conveyor are shown by way of example.
  • the conveyor 3 shown here is a single-lane conveyor.
  • the x-direction is denoted by the arrow 3X
  • the y-direction correspondingly perpendicular thereto is denoted by the arrow 3Y.
  • the two arrows 3X and 3Y lie in the plane of the figure.
  • the transporter 3 has handrails on both sides in relation to the direction of transport, right handrails being denoted by the reference number 5 and left handrails being denoted by the reference numbers 7B and 7A.
  • the railings 5 and 7A, 7B can be substantially similar. These railings can be provided at a suitable height relative to the plane of the plates / transport elements 3B of the conveyor. This ensures that containers, such as bottles, cannot fall to the side on the conveyor and cannot be guided.
  • the railing 7B in Figure 2 is suitably separated at two points 7C, whereby the railing section 7A is separated from the railing 7B.
  • the railing section 7A can be designed to be movable at least in the x direction, that is to say in the transport direction.
  • the railing section 7A can also be designed to be movable in the y direction, that is to say perpendicular to the transport direction.
  • the railing section 7A in Figure 2 attached to the plate 15 with the fastenings / holders 33.
  • the railing 7B is fixed with two further fastenings / holders 31.
  • the holders 31 are fastened purely by way of example on a measuring table 10 on a base plate 11 of the measuring table 10, for example screwed. However, it is also conceivable to fix the holder 31 outside the device 9.
  • the plate 15 is movably mounted on the plate 13 below.
  • rails are used, for example, as they are based on the Figures 3 and 4 are explained in more detail.
  • the plate 13 is in turn movably mounted on the underlying plate 11, the base plate.
  • rails can be used to ensure mobility, as shown by the Figures 3 and 4 is explained in more detail.
  • the plate 13 is shown in FIG Figure 2 movable in the x-direction, i.e. in the transport direction. In other words, the plate 13 moves in the longitudinal direction. With the plate 13, the plate 15 also moves in the longitudinal direction.
  • the plate 15 has no mobility in the x direction relative to the plate 13, so that the plate 15 follows a movement of the plate 13 in the x direction.
  • the railing section 7A is connected to the plate 15 in such a way that a movement of the railing section 7A means a movement of the plate 13 and thus the plate 15 in the x direction. Ie the movement of the Railing section 7A results in the plates 13 and thus 15 following this movement with respect to the x direction.
  • the movement of the plate 13 relative to the base plate 11 is therefore directly correlated with the movement of the railing section 7A.
  • the corresponding movement of the plate 13 and thus of the railing section 7A can be measured by a sensor 13M.
  • a sensor 13M When the containers rub against the railing section 7A, a force can thus be measured in the longitudinal direction.
  • a single sensor 13M is shown for measuring the displacement of the plate 13 and thus the displacement of the railing section 7A in the x direction, that is to say in the longitudinal direction.
  • the sensor 13M can convert the displacement of the plate 13 directly into a force and display or output it.
  • the sensor 13M can be suitably connected to a control device (not shown here) with a line 13L.
  • the control device can evaluate the data taken by means of the sensor 13M and record it, for example, on a memory unit (not shown).
  • the plate 15 is movable essentially perpendicular to the plate 13 in the y-direction.
  • a movement of the railing section 7A which is caused by transverse forces, that is to say forces in the y direction, can be transmitted to the plate 15.
  • the movement of the plate 15 can be measured similarly to the plate 13 with suitable sensors.
  • the sensors with the reference symbol 15M are fixed, for example, on the plate 13 and are suitable for detecting the movement of the plate 15 in the y direction. This happens similarly with the sensor 13M.
  • the sensors 13M and 15M can be of substantially the same type. Also, the number of the measuring sensors 15M is not limited to two sensors. It is also possible to use several or just one sensor, depending on the application.
  • the sensors 15M are in turn connected to lines 15L, by means of which the signals from the sensors 15M can be forwarded to a control unit, for example a computer. Similar to the sensors 13M, the sensors 15M can convert the movement of the plate directly into a force and display it.
  • the base plate 11 of the measuring table 10 and the plates 13 and 15 can be manufactured from a suitable plate material. Materials with high rigidity and at the same time low weight are suitable for this purpose, so that inertia effects can be avoided.
  • the plates 13 and 15 optionally lockable so that only the movement in one of the two directions x and y can be permitted for certain test measurements in order to consider the transverse forces and the longitudinal forces separately.
  • glue for example glue, a strain gauge or a piezoelectric sensor (both not shown here) to the outside of the railing section 7A.
  • the longitudinal and / or transverse forces can be measured in the x or y direction 3X or 3Y.
  • a strain gauge changes its electrical resistance when it is stretched or compressed. An expansion of the railing section 7A in the x or y direction can thereby be measured by means of a strain gauge and converted into a frictional force and thus a friction coefficient.
  • the plate 15 and thus the sensors 15M with line 15L can be completely dispensed with and the measurement of the transverse forces can essentially be carried out by means of a strain gauge, as described above.
  • the longitudinal forces are measured as described above by means of the movement of the railing section 7A and the movement of the plate 13 that is correlated therewith.
  • the transverse forces are measured by the elongation of the railing section 7A measured by means of the strain gauge.
  • control unit (not shown here) can calculate the coefficients of friction / friction coefficients from the longitudinal forces and transverse forces determined.
  • FIG. 13 is a side view of the embodiment shown based on FIG Figure 2 was described above.
  • the carrier is off Figure 2 in the Figure 3 Not shown.
  • the base plate 11 of the measuring table 10 can again be seen.
  • a rail 17 is shown by way of example on the base plate 11.
  • the rail 17 is indicated here as an essentially round guide rail, but other cross-sections of the rail are also conceivable.
  • two carriages 17W are indicated, which can roll or slide on the rail 17.
  • the direction of movement on the rail 17 is indicated by the arrow 17X.
  • the movement along the rails can be designed with as little friction as possible by suitable means and an air cushion or electromagnetic levitation technique or a rolling technique or a low-friction sliding technique, for example with suitable ceramics, can be selected.
  • the number of cars 17W is not limited to two cars; it is also conceivable to use a wider car, for example, or more than two cars.
  • the carriages 17 are connected to the plate 13. In Figure 3 For example, they are fixed, for example screwed, to the underside of the plate 13, so that the plate 13 can be moved along the rail 17.
  • Figure 3 shows on the left a sensor 13M, which has already been used in connection with the Figure 2 has been described.
  • the sensor 13M is for example to measure the movement of the plate 13 in the x direction.
  • a connector between the plate 13 and the sensor 13M is shown with the reference numeral 13V.
  • two rails 19 are shown perpendicular to the plane of the figure. Again, the number of rails is to be understood purely as an example and it is also possible to use a different number of rails.
  • the rails 19 are attached to the surface of the plate 13, for example screwed or glued on.
  • two carriages 19W are shown which can slide or roll on the rails 19. What has already been said above with regard to the rails 17 applies analogously to the sliding or rolling technique.
  • the carriages 19 are connected to the underside of the plate 15, for example screwed or glued. The movement of the plate 15 in the y direction, ie out of the plane of the figure, can thereby be measured. Since this movement, as already explained above, is correlated with the transverse force acting on the railing section 7A, the transverse force can also be measured as a result.
  • FIG. 11 shows an alternative to the embodiment shown in FIG Figure 3 is shown.
  • rails 119 are attached to the base plate.
  • Two carriages 119W can move on the rails 119.
  • the movement of the carriage 119W out of the plane of the figure is used to measure the transverse forces. In other words, the force in the y direction is measured here by means of the movement of the plate 13.
  • the carriages 119W are attached to the underside of the plate 13, for example screwed.
  • a rail 117 is provided on the top of the plate 13, which the rail 17 in Figure 3 resembles.
  • Two carriages 117W can slide or roll on the rail 117, similar to the carriages 17W in FIG Figure 3 .
  • the carriages 117 W are connected to the underside of the plate 15.
  • the direction of movement of the plate 15 is indicated by the arrow 117X.
  • a measuring sensor 115M is attached to the plate 13 in such a way that it can measure the movement of the plate 15 in the x direction. This allows the movement of the railing section 7A Figure 2 can be determined and converted into a longitudinal force.
  • a connector between plate 15 and sensor 115M is shown at 115V.
  • the sensors can be suitable measuring sensors that can measure the acting longitudinal and transverse forces through displacement measurement, piezoelectric effect, capacitive measurement or inductive measurement or optical measurement.
  • FIG. 5 shows a method for determining coefficients of friction according to the present invention.
  • step S210 the longitudinal forces are determined which occur when the containers rubbing against a railing section, as shown for example in FIG Figure 2 has been described. As a result, there is a force or a force component in the x direction, that is to say in the transport direction.
  • step S220 it is checked whether the transverse forces are measured essentially simultaneously with the longitudinal forces during the process. If this is the case, the transverse forces are determined in step S221. It goes without saying that this determination can take place essentially simultaneously with the determination of the longitudinal forces. The determination of the transverse forces can be done as it is based on de Figures 2 - 4 has been described.
  • predefined data are used in step S223. These predetermined data can be entered in step S223. This can also be understood to mean that these data are read out from a storage medium, for example a storage unit. These data are taken for the force F N. If several data or even data sets are available, these data or data sets can also be averaged in order to obtain the force F N. Instead of a transverse force, a normalization variable can also be entered in step S225.
  • step S230 the coefficients of friction are determined from the ratio of the longitudinal and transverse forces from steps S210 on the one hand and S221 or S223 / S225 on the other hand.
  • the determined coefficients of friction are compared with a threshold coefficient of friction.
  • step S260 If the threshold coefficient of friction is exceeded, measures for maintenance and / or correction can be initiated. For example, lubricants or even water can be applied to the railings. It is also possible to add additives to the plastic mixture of the preforms during the manufacture of the containers in order to influence their surface properties. All measures already described for the device are conceivable.
  • the method ends in step S260 or it begins again with step S210.
  • step S240 not only can the current coefficient of friction be considered, but it is also possible to compare a development of the coefficient of friction over time and thus the friction properties of the containers under consideration with suitable thresholds. It is possible to consider several thresholds so that certain measures are only initiated when certain thresholds are exceeded. The success of the measures introduced can also be viewed. For example, crossing a threshold a little may only require the application of lubricants or water to the railings. However, if a threshold is clearly exceeded - or, similarly, a further, higher threshold is exceeded - maintenance may be necessary.

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Automation & Control Theory (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Escalators And Moving Walkways (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Claims (22)

  1. Dispositif (9) pour déterminer les coefficients de frottement lorsque des conteneurs qui sont transportés sur un convoyeur (3) frottent contre des rambardes (5, 7A, 7B) du convoyeur (3), les conteneurs étant guidés entre des rambardes (5, 7A, 7B) circulant des deux côtés, comprenant: une table de mesure (10); un premier capteur (13M) monté sur la table de mesure (10), et caractérisé en ce qu'au moins une partie (7A) des rambardes (5, 7A, 7B) dans la zone de la table de mesure (10) est conçue pour être mobile par rapport à la table de mesure (10) et la partie (7A) a au moins un mouvement dans une direction (3X), appelée direction x, qui est sensiblement parallèle à la direction de transport (3A) du convoyeur (3), dans laquelle le premier capteur (13M) mesure une force avec laquelle la partie mobile de la rambarde est déplacée ou poussée pendant le transport des conteneurs.
  2. Dispositif (9) selon la revendication 1, comportant une unité de commande et une unité de mémoire, dans lequel l'unité de commande mémorise les valeurs de mesure du premier capteur (13M) sur l'unité de mémoire et est conçue de telle sorte qu'elle peut déterminer les coefficients de frottement sur la base des valeurs de mesure du premier capteur (13M) en tenant compte de données relatives aux forces transversales exercées sur les garde-corps par les conteneurs sensiblement perpendiculairement à la direction de transport du convoyeur (3).
  3. Dispositif (9) selon la revendication 2, dans lequel l'unité de commande est conçue pour comparer les valeurs de frottement et/ou les valeurs mesurées du premier capteur (13M) avec une valeur seuil correspondante et pour déclencher des mesures préventives et/ou correctives si la valeur seuil correspondante est dépassée.
  4. Dispositif (9) selon l'une des revendications 2 ou 3, dans lequel les données concernant les forces transversales sont des données prédéterminées qui sont stockées, par exemple, sur l'unité de stockage.
  5. Dispositif (9) selon au moins une des revendications 1-3, comprenant un second capteur (15M) mesurant une force agissant plus ou moins de façon perpendiculaire à la direction x (3X) et sensiblement parallèle au plan du convoyeur (3) et exercée sur la partie mobile (7A) de la rambarde (7A, 7B) pendant le transport des conteneurs.
  6. Dispositif (9) selon au moins l'une des revendications 1 à 5, dans lequel le premier et/ou le second capteur (13M, 15M) est une jauge de contrainte ou un capteur piézoélectrique monté sur l'extérieur de la partie de la rambarde (7A).
  7. Appareil (9) selon la revendication 5, dans lequel le second capteur (15M) est monté sur la table de mesure (10), dans lequel la partie mobile (7A) des rambardes (7A, 7B) peut en outre effectuer un mouvement dans une direction (3Y) appelée direction y, qui est sensiblement perpendiculaire à la direction x (3X) et sensiblement parallèle au plan du convoyeur (3), le second capteur (15M) étant capable de mesurer une force avec laquelle la partie mobile (7A) de la rambarde (7A, 7B) est déplacée dans la direction y (3Y) pendant le transport des conteneurs.
  8. Dispositif (9) selon au moins l'une des revendications 5 à 7 en combinaison avec l'une des revendications 2 ou 3, dans lequel l'unité de commande mémorise les valeurs de mesure du second capteur (15M) sur l'unité de mémoire et détermine les coefficients de frottement sur la base des valeurs de mesure du premier capteur (13M) en tenant compte des données concernant les forces transversales exercées par les conteneurs sur les rambardes (5, 7A, 7B) sensiblement perpendiculaires à la direction de transport (3A) du convoyeur (3) par les conteneurs, dans lequel les données concernant les forces transversales sont fondées sur les valeurs de mesure du second capteur (15M).
  9. Dispositif (9) selon la revendication 8, dans lequel l'unité de commande compare les valeurs de frottement et/ou les valeurs mesurées du second capteur (15M) avec une valeur seuil correspondante et déclenche des mesures préventives et/ou correctives en cas de dépassement de la valeur seuil correspondante.
  10. Dispositif (9) selon l'une des revendications 3 ou 9, dans lequel les mesures préventives comprennent l'entretien du convoyeur (3), et dans lequel les mesures correctives comprennent au moins l'une des mesures suivantes pour réduire le frottement: l'ajout d'additifs, tels que des lubrifiants, au cours du processus de fabrication des récipients ou des préformes, l'application de lubrifiants ou la pulvérisation d'eau sur les rambardes (5, 7A, 7B) du convoyeur (3), la pulvérisation d'eau sur les récipients, l'application de lubrifiants sur les préformes ou, en général, la modification des paramètres du processus au cours de la fabrication des préformes ou des récipients.
  11. Dispositif (9) selon au moins une des revendications 1 à 10, comprenant un premier rail (17) qui est fixé sur la table de mesure (10) et qui est orienté sensiblement dans la direction x (3X), dans lequel le déplacement de la section (7A) de la rambarde (7A, 7B) peut être effectué au moyen du premier rail (17) dans la direction x (3X).
  12. Dispositif (9) selon au moins une des revendications 7 à 11, comprenant un second rail (19) qui est fixé sur la table de mesure (10) et qui est orienté sensiblement dans la direction y (3Y), le déplacement de la section (7A) de la rambarde (7A, 7B) pouvant être effectué au moyen du second rail (19) dans la direction y (3Y).
  13. Appareil (9) selon la revendication 12, dans lequel la table de mesure (10) comprend une plaque de base (11),
    le premier rail (17) étant fixé à la plaque de base (11), tandis qu'une autre plaque (13) peut se déplacer sur le premier rail (17), le mouvement de l'autre plaque (13) étant dans la direction correspondant à la direction du premier rail (17), sur laquelle autre plaque (13) est fixé le second rail (19), sur lequel second rail (19) le mouvement de la partie (7A) de la rambarde (7A, 7B) peut être dans la direction correspondant au second rail (19); ou le second rail (119) étant fixé à la plaque de base (11), tandis qu'une autre plaque (13) peut se déplacer sur le second rail (119), le mouvement de l'autre plaque (13) étant dans la direction correspondant à la direction du second rail (119), sur lequel autre plaque (13) le premier rail (117) est fixé, sur lequel premier rail (117) le mouvement de la partie (7A) de la rambarde (7A, 7B) peut être dans la direction correspondant au premier rail (117).
  14. Procédé pour déterminer des coefficients de frottement lorsque des conteneurs qui sont transportés sur un convoyeur (3) frottent contre des rambardes (5, 7A, 7B) du convoyeur (3), les conteneurs étant guidés entre des rambardes (5, 7A, 7B) circulant des deux côtés, caractérisé en ce qu'au moins une section (7A) des rambardes (7A, 7B) est mobile et la partie (7A) peut effectuer au moins un mouvement dans une direction (3X), appelée direction x, qui est sensiblement parallèle à la direction de transport (3A) du convoyeur (3), de sorte qu'on peut mesurer une force avec laquelle la partie mobile (7A) de la rambarde (7A, 7B) est déplacée pendant le transport des conteneurs sur le convoyeur (3).
  15. Procédé selon la revendication 14, dans lequel les coefficients de frottement sont déterminés à partir des valeurs mesurées de la force exercée sur la partie mobile (7A) de la rambarde (7A, 7B) dans la direction x (3X), en tenant compte des données relatives aux forces transversales exercées sur les rambardes (7A, 7B) par les conteneurs plus ou moins de façon perpendiculaire à la direction de transport (3A) du convoyeur (3).
  16. Procédé selon la revendication 14 ou 15, dans lequel les coefficients de frottement et/ou les valeurs mesurées de la force dans la direction x (3X) sont comparés à une valeur seuil correspondante et des mesures préventives et/ou correctives sont initiées si la valeur seuil correspondante est dépassée.
  17. Procédé selon les revendications 15 ou 16, dans laquelle les données concernant les forces transversales sont des données prédéterminées.
  18. Procédé selon au moins une des revendications 14 à 16, dans lequel on mesure une force qui est exercée dans une direction (3Y), dite direction y, plus ou moins perpendiculaire à la direction x (3X) et sensiblement parallèle au plan du convoyeur (3) sur la partie mobile (7A) de la rambarde (7A, 7B) pendant le transport des conteneurs.
  19. Procédé selon au moins l'une des revendications 14 à 16, dans lequel la partie mobile (7A) des rambardes (7A, 7B) peut en outre effectuer un mouvement dans une direction (3Y), appelée direction y, qui est sensiblement perpendiculaire à la direction x (3X) et sensiblement parallèle au plan du convoyeur (3), dans lequel la force avec laquelle la partie mobile (7A) des rambardes (7A, 7B) est déplacée dans la direction y (3Y) peut être mesurée pendant le transport des conteneurs.
  20. Procédé selon la revendication 19 en combinaison avec l'une des revendications 15 ou 16, dans lequel les coefficients de frottement sont déterminés à partir des valeurs mesurées de la force dans la direction x en tenant compte des données relatives aux forces transversales exercées sur les rambardes (7A, 7B) sensiblement perpendiculairement à la direction de transport (3A) du convoyeur (3) par les conteneurs, dans lequel les données relatives aux forces transversales sont fondées sur les valeurs mesurées relatives à la force dans la direction y (3Y).
  21. Procédé selon la revendication 20, dans lequel les valeurs mesurées de la force dans la direction y (3Y) sont comparées avec une valeur seuil correspondante et des mesures préventives et/ou des mesures correctives sont prises si la valeur seuil correspondante est dépassée.
  22. Procédé selon l'une des revendications 16 ou 21, dans lequel les mesures préventives comprennent l'entretien du convoyeur (3), et dans lequel les mesures correctives comprennent au moins l'une des mesures suivantes pour réduire le frottement: ajouter des additifs, par exemple des lubrifiants, pendant le processus de fabrication des récipients ou des préformes, appliquer des lubrifiants ou pulvériser de l'eau sur les rambardes (5, 7A, 7B) du convoyeur (3), pulvériser de l'eau sur les récipients, appliquer des lubrifiants sur les préformes ou, en général, modifier les paramètres du processus pendant la fabrication des préformes ou des récipients.
EP12185197.6A 2011-10-13 2012-09-20 Dispositif et procédé destinés à déterminer des coefficients de frottement Active EP2581727B1 (fr)

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DE102011084451A DE102011084451A1 (de) 2011-10-13 2011-10-13 Vorrichtung und Verfahren zur Ermittlung von Reibwerten

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NL2011275C2 (en) * 2013-08-07 2015-02-10 Rexnord Flattop Europe Bv A conveyor system, a conveyor and lubricating system, a friction coefficient measuring device and an item base surface friction coefficient measuring device both for use in such a system.
DE102013218402A1 (de) * 2013-09-13 2015-03-19 Krones Ag Vorrichtung und Verfahren zum Durchführen von Sonderfunktionen einer Transporteinrichtung in einer Behälterbehandlungsanlage
CN104181101B (zh) * 2014-09-05 2016-08-24 石家庄铁道大学 钢轨表面摩擦系数测量装置
CN106092876B (zh) * 2016-08-08 2019-02-15 中山市鸿勋机械有限公司 一种摩擦系数测试仪
CN107421833B (zh) * 2017-05-27 2023-03-28 中国矿业大学 一种提升容器衬板的自检测装置及检测方法
DE202018103973U1 (de) * 2018-07-11 2019-10-16 Forschungsgesellschaft Umformtechnik Mbh Messanordnung zur Bestimmung des Reibungskoeffizienten und Prüfkörper
EP3817998A1 (fr) 2018-09-07 2021-05-12 Packsize LLC Commande d'accélération adaptative pour machine d'emballage
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DE102022118509A1 (de) * 2022-07-25 2024-01-25 Khs Gmbh Anordnung aufweisend eine Führungsschiene einer Transportvorrichtung zum Transportieren von Behältern und eine Schmiervorrichtung, und Verfahren zum Schmieren einer Führungsschiene

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PT2581727T (pt) 2020-12-15
CN103048262B (zh) 2015-12-02
DE102011084451A1 (de) 2013-04-18
EP2581727A2 (fr) 2013-04-17
CN103048262A (zh) 2013-04-17

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